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FIGUUR 9.1 toon 'n bandaandrywingsstelsel met 'n 230 mm-dryfkatrol - English General - NSC Mechanical Technology Welding and Metalwork - Question 9 - 2016 - Paper 1

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FIGUUR 9.1 toon 'n bandaandrywingsstelsel met 'n 230 mm-dryfkatrol. Die bandspoed in hierdie stelsel is 36 m.s⁻¹. Die trekkrag in die stelsel is 140 N en die verhoud... show full transcript

Worked Solution & Example Answer:FIGUUR 9.1 toon 'n bandaandrywingsstelsel met 'n 230 mm-dryfkatrol - English General - NSC Mechanical Technology Welding and Metalwork - Question 9 - 2016 - Paper 1

Step 1

9.1.1 Rotasiefrekwensie van die dryfkatrol in r/min

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Answer

Om die rotasiefrekwensie van die dryfkatrol te bereken, gebruik ons die formule:

V = rac{n imes ext{D}}{60}

Hierbinne is:

  • V=36extm/sV = 36 ext{ m/s} (bandspoed)
  • D=0.23extmD = 0.23 ext{ m} (diameter)

Eerstens bereken ons die omtrek van die dryfkatrol:

extOmtrek=extπimesD=extπimes0.23extm ext{Omtrek} = ext{π} imes D = ext{π} imes 0.23 ext{ m}

Hierna kan ons die rotasiefrekwensie nn bereken:

n = rac{V imes 60}{ ext{π} imes D} = rac{36 imes 60}{ ext{π} imes 0.23} \\ = 2989.35 ext{ r/min}

Step 2

9.1.2 Drywing wat in hierdie stelsel oorgedra word

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Answer

Die drywing wat in die stelsel oorgedra word kan bereken word deur die spanning in die stywe kant (T2T_2) en die slap kant (T1T_1) te oorweeg.

Gegewe: T1=2.5imesT2T_1 = 2.5 imes T_2 en T2=140extNT_2 = 140 ext{ N}.

Bereken eerstens T1T_1:

T1=2.5imes140extN=350extNT_1 = 2.5 imes 140 ext{ N} = 350 ext{ N}

Die totale drywing PP kan dan bereken word:

P=(T1T2)imesextW=(350extN140extN)imes36P = (T_1 - T_2) imes ext{W} = (350 ext{ N} - 140 ext{ N}) imes 36

P=7560extWextof7.56extkWP = 7560 ext{ W} ext{ of } 7.56 ext{ kW}

Step 3

9.2.1 Rotasiefrekwensie van die inset-as op die elektriese motor

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Answer

Vir die inset-as se rotasiefrekwensie, gebruik ons die verhouding tussen die tande:

N_{ ext{inset}} = N_{ ext{uitset}} imes rac{T_b imes T_{ ext{C}} imes N_{ ext{uitset}}}{T_a imes T_d}

Hier is gegewe:

  • Ta=18T_a = 18, Tb=36T_b = 36 (NaN_a en NbN_b tande)

Die rotasiefrekwensie van die uitset-as kan hierna berekend word:

Nextuitset=180extr/minN_{ ext{uitset}} = 180 ext{ r/min}

Volgende kan die tussenas se rotasiefrekwensie bereken word, wat gegee word as:

Nextinset=36imes46imes60/160N_{ ext{inset}} = 36 imes 46 imes 60 / 160

Hierna kan die rotasiefrekwensie NextinsetN_{ ext{inset}} saam met die gegewe waardes bereken word.

Step 4

9.2.2 Lugslakke

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Answer

Die berekening van lugslakke kan gebaseer wees op die tande en die rotasies waarvoor die dryf meganisme in plek is. Dit behels die verhouding en hoe die lugslakke met die elektriese motor geaktiveer moet word of nie. Dit moet ook oorweeg word hoeveel tande optel op die dryfwenke tussen die komponent.

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